The Moon has a diameter of about 3,474 kilometers (2,159 miles), which is roughly 27% (a bit more than one-quarter) the diameter of Earth
. In terms of size comparison, Earth is about four times wider than the Moon. The Moon's surface area is approximately 38 million square kilometers (14.6 million square miles), which is comparable to the combined size of continents like Europe, China, and the United States
. The Moon's mass is about 1.2% that of Earth's, making it the fifth largest natural satellite in the Solar System and the largest relative to its primary planet
. Its radius is approximately 1,737.5 kilometers (1,080 miles)
. To put it simply, the Moon is about as wide as the contiguous United States and is significantly smaller than Earth but larger than many other moons and dwarf planets like Pluto
